71M6541DSLASHFSLASHG datasheet(115/166 Pages) MAXIM

115 / 166 page

71M6541D/F/G and 71M6542F/G Data Sheet

Rev 5

115

Name

Location

Rst Wk

Dir

Description

FL_BANK

SFR B6

01 01 R/W

Flash Bank Selection (71M6541G and 71M6542G only)

The program memory of the 71M6541G/71M6542G consists of a fixed lower

bank of 32 KB, addressable at 0x0000 to 0x7FFF plus an upper banked area

of 32 KB, addressable at 0x8000 to 0xFFFF. The I/O RAM register FL_BANK

is used to switch one of four memory banks of 32 KB each into the address

range from 0x8000 to 0xFFFF. Note that when FL_BANK = 0, the upper bank

is the same as the lower bank.

FL_BANK[1:0]

Address Range for

Lower Bank

(0x0000-0x7FFF)

Address Range for

Upper Bank

(0x8000-0xFFFF)

0x0000-0x7FFF

0x00000-0x07FFF

0x0000-0x7FFF

0x08000-0x0FFFF

0x0000-0x7FFF

0x10000-0x17FFF

0x0000-0x7FFF

0x18000-0x1FFFF

FLSH_ERASE[7:0]

SFR 94[7:0]

Flash Erase Initiate

FLSH_ERASE is used to initiate either the Flash Mass Erase cycle or the Flash

Page Erase cycle. Specific patterns are expected for FLSH_ERASE in order

to initiate the appropriate Erase cycle.

(default = 0x00).

0x55 = Initiate Flash Page Erase cycle. Must be proceeded by a write to

FLSH_PGADR[5:0] (SFR 0xB7[7:2]).

0xAA = Initiate Flash Mass Erase cycle. Must be proceeded by a write to

FLSH_MEEN and the ICE port must be enabled.

Any other pattern written to FLSH_ERASE has no effect.

FLSH_MEEN

SFR B2[1]

Mass Erase Enable

0 = Mass Erase disabled (default).

1 = Mass Erase enabled.

Must be re-written for each new Mass Erase cycle.

FLSH_PEND

SFR B2[3]

Indicates that a timed flash write is pending. If another flash write is attempted,

it is ignored.

FLSH_PGADR[5:0]

SFR B7[7:2]

Flash Page Erase Address

FLSH_PGADR[5:0] – Flash Page Address (page 0 thru 63) that is erased during

the Page Erase cycle. (default = 0x00).

Must be re-written for each new Page Erase cycle.

71M6541D/F/G Datasheet(PDF) 115 Page - Maxim Integrated Products

71M6541D/F/G Datasheet(HTML) 115 Page - Maxim Integrated Products

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